closeup and macro shot of nudibranch pleurobranch sidegill slug, berthella martensi during leisure dive in sabah, borneo.

animal aquatic are been berthella biology blue borneo branch close closeup colorful colourful colours coral detail dive dorid extraordinary family forms gastropod gills given group have larval leisure life macro malaysia marine martensi match mollusc molluscs mollusk mollusks national nature nicknames noted nudibranch nudibranchs ocean often outdoor photography pleurobranch pleurobranchidae reef sabah scuba sea shed shells shot sidegill slug slugs snail softbodied stage striking thailand their they tide travel undersea underwater water which